Wetting Behavior of Molten Cu-Si Alloy on Synthesized BN Powder of Varying Crystallinities

doi:10.11901/1005.3093.2025.288

Chinese Journal of Materials Research

2026, Vol. 40

Issue (6): 457-464 DOI: 10.11901/1005.3093.2025.288

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Wetting Behavior of Molten Cu-Si Alloy on Synthesized BN Powder of Varying Crystallinities

YANG Ruitao¹^,², LIANG Bin², PANG Shengyang², HU Chenglong², ZHANG Wei³, FAN Junling³, TANG Sufang²(

)

^1.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.National Key Laboratory of Strength and Structural Integrity, Aircraft Strength Research Institute of China, Xi'an 710065, China

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YANG Ruitao, LIANG Bin, PANG Shengyang, HU Chenglong, ZHANG Wei, FAN Junling, TANG Sufang. Wetting Behavior of Molten Cu-Si Alloy on Synthesized BN Powder of Varying Crystallinities. Chinese Journal of Materials Research, 2026, 40(6): 457-464.

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Abstract

Carbon fiber-reinforced ceramic-metal matrix composites, represented by C/SiC-Cu, show potential applications in thermal protection systems of high-speed aircraft due to their exceptional long-term oxidation and ablation resistance at ultra-high temperatures. Hexagonal boron nitride (h-BN) characterized by its hexagonal lamellar structure is an ideal interfacial material, given that it is one of the few materials that does not wet with liquid silicon and possesses excellent oxidation resistance. However, there is currently no public literature on the wetting behavior of Cu-Si alloys to h-BN material. In this study, h-BN powder was synthesized in nitrogen atmosphere with boric acid and urea as raw materials, and the wetting behavior of molten Cu-Si alloy to h-BN matrix, as well as the influence of its crystallinity on the wettability were investigated. The results indicate that among others, the h-BN synthesized at 1400 ^oC with the molar ratio of boric acid to urea is 1:2 presents the highest purity and crystallinity. While the varying crystallinities of the synthesized h-BNs show little influence on the wetting behavior of Cu-Si alloy. This can be attributed to the absence of dangling bonds on h-BN surfaces, namely, the extremely low surface energy of h-BN, and the similar intrinsic surface properties of h-BN with different crystallinity. The findings may provide a significant reference for the preparation of BN interfacial layers on carbon fiber and the regulation of properties of carbon fiber-reinforced ceramic (-metal) matrix composites.

Key words: inorganic non-metallic materials crystallinity wetting behavior BN Cu-Si alloy C/SiC-Cu

Received: 17 September 2025

ZTFLH:

TB321

Fund: National Natural Science Foundation of China(52272075);National Natural Science Foundation of China(52402095);National Natural Science Foundation of China(52472053)

Corresponding Authors: TANG Sufang, Tel: (024)83978056, E-mail: sftang@imr.ac.cn

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	YANG Ruitao
	LIANG Bin
	PANG Shengyang
	HU Chenglong
	ZHANG Wei
	FAN Junling
	TANG Sufang

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https://www.cjmr.org/EN/10.11901/1005.3093.2025.288 OR https://www.cjmr.org/EN/Y2026/V40/I6/457

Fig.1 XRD patterns of h-BN products from urea and boric acid with different molar ratios at 1000 ^oC(a) and 1200 ^oC (b)

Fig.2 XRD patterns of h-BN samples prepared at different nitridation temperatures

Fig.3 Raman spectra of h-BN samples prepared at different nitridation temperatures

Fig.4 XPS full spectra of h-BN samples (a) BN1400, (b) BN1200, (c) BN1000

Fig.5 XPS fine spectra of BN1400 (a-c), BN1200 (d-f), and BN1000 (g-i) samples (a, d, g) B 1s, (b, e, h) N 1s, (c, f, i) O 1s

Table 1 Elemental compositions obtained from XPS full spectra (atomic fraction, %)

Fig.6 HRTEM images and SAED patterns of BN1400 (a) and BN1000 (b) samples

Fig.7 TG-DTA curves of the boric acid and urea mixture (molar ratio 1:2)

Fig.8 Macro-images of Cu-Si alloy during wetting test

Fig.9 Wetting curves of Cu-Si alloy on BN1400 (a) and BN1000 (b)

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